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• 2.0 SUMMARY AND CONCLUSIONS <br />2.1 Summary <br />The objective of this project for the proposed Yoast mine was <br />to determine geologic conditions that could affect the design, <br />construction and maintenance of slightly less than five miles of <br />haul road, and of a sedimentation pond. Another objective was to <br />comment on general geologic conditions at eight topsoil stockpile <br />areas. <br />The haul road originates at Routt County Road 27 at an <br />elevation of about 6552 feet and terminates at the mine area at an <br />elevation of about 7248 feet for a total elevation difference of <br />about 696 feet. <br />Slightly more than the first three miles of the haul road <br />• alignment traverses moderately eroded topography formed by <br />weathering and erosion of bedrock that is primarily shale with <br />lesser amounts of sandstone. Throughout most of this reach the <br />alignment is composed of long straight segments tangent to large <br />radius curves. <br />The balance of the alignment (B segment) follows the main <br />drainage course that flows northward from the mine area, and <br />includes mostly short-radius curves and shorter straight reaches <br />than is the case with the A road. The last 0.5 mile of the <br />alignment includes a number of short-radius curves and relatively <br />short, straight tangential reaches between them. From about Sta. <br />20+00 to its terminus the alignment traverses competent sandstone <br />bedrock and its weathering products along with relatively minor <br />• amounts of shale. <br />5 <br />